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Method for simultaneously reducing municipal sludge and producing hydrogen, and municipal sludge treatment device

A municipal sludge and sludge technology, which is applied in the direction of electrochemical sludge treatment, water/sludge/sewage treatment, sludge treatment, etc., can solve the problems of low resource utilization efficiency, cumbersome production process, limited treatment capacity, etc. , achieve high sludge digestion and hydrogen production efficiency, and low energy consumption

Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN103887550A discloses a solid oxide fuel cell using sludge as fuel, which can realize the safe treatment of sludge and obtain electric energy, but the manufacturing process is cumbersome and the processing capacity is limited
[0006] It can be seen from the above examples that the use of traditional MFC or MEC technology to treat excess sludge must go through a pretreatment process. This is because MFC and MEC technology use the interaction between electrogenic microorganisms and small molecular organic substances in sludge. But it can't do anything to the tissue components such as the cell membrane that makes up the sludge, and can't play the role of breaking the sludge cells.
In addition, MFC and MEC technologies use electricity-producing microorganisms on the anode as catalysts. Based on anaerobic biological processes, the removal of proteins is often less than 60%, and the efficiency of resource utilization is low.

Method used

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  • Method for simultaneously reducing municipal sludge and producing hydrogen, and municipal sludge treatment device
  • Method for simultaneously reducing municipal sludge and producing hydrogen, and municipal sludge treatment device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The sludge used in this example is excess sludge from municipal sewage treatment plants. After dehydration and drying, the volatile solid content is 15703 mg / L, accounting for 74% of the total sludge (dry basis).

[0075] This embodiment adopts figure 1 The device shown is processed according to the following process, wherein the volume of the mixing pool and the cathode pool are both 500mL, the volume of the anode pool is 50mL, the catholyte used in the cathode pool is 1mol / L phosphoric acid aqueous solution, and the anode is a carbon cloth electrode , the cathode is a platinum carbon electrode (the content of platinum is 0.5mg / cm 2 ).

[0076] Pass water into the mixing tank, then add phosphomolybdic acid, start the stirring paddle for stirring, dissolve phosphomolybdic acid in water to form an aqueous solution with a concentration of 0.3mol / L. The temperature of this aqueous solution was heated to 80°C. Then, with stirring, excess sludge was added to the mixing ta...

Embodiment 2

[0088] The remaining sludge is treated in the same way as in Example 1, the difference is that during the electrolysis process, the voltage of the applied direct current is adjusted to control the current density to 0.1A / cm 2 .

[0089] The experimental results are listed in Table 1.

Embodiment 3

[0091] The remaining sludge is treated in the same way as in Example 1. The difference is that during the electrolysis process, the voltage of the applied direct current is adjusted to control the current density to 0.05A / cm 2 .

[0092] The experimental results are listed in Table 1.

[0093] Table 1

[0094] Numbering

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Abstract

The invention discloses a method for simultaneously reducing municipal sludge and producing hydrogen, and a municipal sludge treatment device. The method comprises the following steps: mixing the municipal sludge with polyoxometallic acid to obtain a polyoxometallic acid-containing sludge slurry; and sending the polyoxometallic acid-containing sludge slurry to an electrolysis tank, and applying adirect current to carry out electrolysis in order to obtain hydrogen and sludge with a reduced content of volatile solids. The method utilizes the oxidation and hydrolysis effects of the polyoxometallic acid on microbial cells to decompose the microbial cells in the sludge in order to simultaneously realize great reduction and hydrogen production. Compared with methods for treating municipal sludge based on an MFC or MEC technology, the method in the invention is free from the limitation of the temperature, the pH value and other parameters in a pretreatment stage on conventional biochemical treatment methods, can be started directly without domestication and cultivation of microorganisms, and can get a higher sludge digestion rate and a higher hydrogen production efficiency with less energy consumption.

Description

technical field [0001] The invention relates to a method for reducing municipal sludge and synchronously producing hydrogen, and also relates to a municipal sludge treatment device. Background technique [0002] The biochemical treatment process is the core of sewage treatment. A large amount of excess sludge is inevitably discharged during operation. The solid phase of these sludges is mainly composed of a large number of microorganisms, viruses, parasites and other microorganisms, and also contains a small amount of organic and inorganic substances. A key pollutant to be controlled. The "Water Ten Rules" promulgated by the state specifically incorporates sludge treatment and disposal into the key management of the sewage system, which shows the importance attached to sludge disposal. [0003] The usual method of excess sludge treatment is to dehydrate the sludge and then incinerate or landfill, but the accompanying toxic gas emissions such as dioxins, large-scale occupati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/06C25B1/02C25B9/00
CPCC02F11/006C02F11/06C02F2303/06C25B1/02C25B9/00
Inventor 赵锐马欣
Owner CHINA PETROLEUM & CHEM CORP
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